Messages in this thread | | | Date | Wed, 9 Jun 1999 15:28:40 -0400 (EDT) | From | Chuck Lever <> | Subject | Re: [patch] 2.2.9_andrea-VM1.gz |
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On Tue, 8 Jun 1999, Peter Steiner wrote: > > >Maybe an average bucketsize of 8 is too high? This is sufficient with 64MB > > >since the buffer cache doesn't grow so much anyway. Try reducing it to 4 > > >(The original hashfn has an average bucketsize of 1). > > > > Good idea, I'll set the distribution to 1, I don't want to lose because I > > am more conservative in memory. > > Could someone please tell me the typical size of the buffer cache in big > real world servers? > > An average bucketsize of 1 is too much for the average desktop but it may > indeed help for servers. It seems there should be a config option: > > "[*] Optimize for big buffer caches" --> avg bucket zize = 1 > else avg bucket size = 4
i think that's way too complicated. just allocate the hash table depending on the size of physical RAM -- that will get you exactly what you want. on a big machine, wasting a few pages for table space you don't use is inconsequential.
- Chuck Lever -- corporate: <chuckl@netscape.com> personal: <chucklever@netscape.net> or <cel@monkey.org>
The Linux Scalability project: http://www.citi.umich.edu/projects/linux-scalability/
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